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  When a person eats a food allergen, an antibody is formed.
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  It then attaches itself to cells found in tissues in cells all over the body.
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  It binds to antibodies and sends out signals for body to release large amounts of histamine.
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  Histamine causes irritation and swelling in certain parts of the body, aka an allergic reaction.
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  Its different for each individual. You can break out into hives, have shortness of breath, and even die.
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  You would need medication for your reaction. Either over the counter, or a prescription prescribed by your doctor.